Basically, investment is a necessary, but a want or willing is a way to start realizing it. So, if you have willing to invest, this will lead you to start investment for  the shake of  your actual necessary.  But of course, everybody's  necessary is  different. it will also  depend on point of view or considerations and also condition of each person.

Investment is indeed a necessity. However, this is not the main need. However, in this case, what is important is: health comes first. However, compared to preferring to invest in coins instead of thinking about health, I can't immediately judge that it's not good.

First, I have to know what kind of health condition your friend is experiencing? Is it a disease that is urgent to recover from and requires a lot of money? Or a simple illness that doesn't require a lot of money to cure, so he prefers to use the money to invest. But what is certain is that you should still prioritize your health first, before thinking or using some of your money to invest. Continue to use wise financial management so that the investment continues, but your health is also controlled and not neglected.